:root {
  /* Avenia Theme Colors */
  --color-bg: #000000;
  --color-surface: rgba(255, 255, 255, 0.03);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text: #ffffff;
  --color-text-secondary: #94a3b8; /* Slate-400 */
  --color-accent: #00ffd1; /* Avenia Cyan */

  /* Typography */
  --font-display: 'Instrument Serif', serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'Geist Mono', monospace;

  /* Glassmorphism */
  --glass-blur: 16px;
  --glass-bg: rgba(252, 250, 247, 0.03);
  --header-offset: 64px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  min-height: 100vh;
}

body {
  overflow-x: hidden;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 2px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.lang-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: #94a3b8;
  min-width: 46px;
  height: 28px;
  border-radius: 999px;
  padding: 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-btn:hover {
  color: #e2e8f0;
}

.lang-btn.is-active {
  background: #ffffff;
  color: #0b1735;
}

.theme-toggle {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.theme-toggle-track {
  position: relative;
  width: 78px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.theme-toggle-icon {
  font-size: 15px;
  line-height: 1;
  z-index: 1;
  transition: color 0.25s ease, opacity 0.25s ease;
}

.theme-toggle-icon--moon {
  color: #dbe8ff;
  opacity: 0.92;
}

.theme-toggle-icon--sun {
  color: #f8c74f;
  opacity: 0.45;
}

.theme-toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 26px;
  height: 26px;
  border-radius: 999px;
  background: #f8fafc;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0f172a;
  transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), background-color 0.28s ease, box-shadow 0.28s ease;
}

.theme-toggle-thumb::before {
  content: '☾';
  font-size: 12px;
  line-height: 1;
}

body.theme-light {
  --color-bg: #f3f6fb;
  --color-surface: rgba(255, 255, 255, 0.8);
  --color-border: rgba(15, 23, 42, 0.12);
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-accent: #0ea5e9;
}

body.theme-light,
body.theme-light .bg-black {
  background-color: var(--color-bg) !important;
}

body.theme-light .text-white {
  color: var(--color-text) !important;
}

body.theme-light .brand-wordmark {
  color: var(--color-text) !important;
}

body.theme-light .lang-switch {
  background: rgba(255, 255, 255, 0.92);
  border-color: rgba(15, 23, 42, 0.16);
}

body.theme-light .lang-btn {
  color: #64748b;
}

body.theme-light .lang-btn:hover {
  color: #334155;
}

body.theme-light .lang-btn.is-active {
  background: #0f766e;
  color: #f8fafc;
}

body.theme-light .glass-header,
body.theme-light #category-tabs {
  background: var(--color-bg) !important;
  border-bottom: none;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
}

body.theme-light.is-scrolled .glass-header,
body.theme-light.is-scrolled #category-tabs {
  background: var(--color-bg) !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
}

body.theme-light .glass {
  background: rgba(255, 255, 255, 0.78);
  border-color: rgba(15, 23, 42, 0.12);
}

body.theme-light #back-link {
  color: #64748b;
  border-color: rgba(15, 23, 42, 0.16);
  background: rgba(255, 255, 255, 0.9);
}

body.theme-light #back-link:hover,
body.theme-light #back-link:focus-visible {
  color: #ffffff !important;
  border-color: #0f766e !important;
  background: #0f766e;
}

body.theme-light #copy-design,
body.theme-light #download-design {
  color: #334155 !important;
  border-color: rgba(15, 23, 42, 0.2) !important;
  background: rgba(255, 255, 255, 0.92);
}

body.theme-light #copy-design:hover,
body.theme-light #copy-design:focus-visible,
body.theme-light #download-design:hover,
body.theme-light #download-design:focus-visible {
  color: #ffffff !important;
  border-color: #0f766e !important;
  background: #0f766e;
}

body.theme-light #detail-source {
  color: #475569 !important;
}

body.theme-light #detail-source:hover,
body.theme-light #detail-source:focus-visible {
  color: #0f766e !important;
  text-decoration: none;
}

body.theme-light .grid-item:hover .grid-card {
  border-color: rgba(15, 23, 42, 0.18);
  box-shadow: 0 18px 32px rgba(15, 23, 42, 0.14);
}

body.theme-light .card-cta-arrow {
  border-color: rgba(15, 23, 42, 0.18);
  color: #334155;
}

body.theme-light .grid-item:hover .card-cta-arrow {
  background: #0f766e;
  border-color: #0f766e;
  color: #f8fafc !important;
  box-shadow: 0 8px 20px rgba(15, 118, 110, 0.32);
  transform: scale(1.1);
}

body.theme-light .category-pill {
  color: #334155;
}

body.theme-light .category-pill:hover {
  background: rgba(15, 23, 42, 0.08);
  border-color: rgba(15, 23, 42, 0.18);
}

body.theme-light .category-pill.is-active,
body.theme-light .category-pill.is-active:hover,
body.theme-light .category-pill.is-active:focus-visible {
  background: #0b1735;
  color: #f8fafc !important;
  border-color: #0b1735;
  box-shadow: none;
}

body.theme-light .text-brand {
  color: #0f766e !important;
}

body.theme-light .bg-brand {
  background-color: #0f766e !important;
}

body.theme-light .text-gradient {
  background: linear-gradient(135deg, #0f172a 0%, #64748b 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.theme-light .theme-toggle-icon--moon {
  color: #7f8ea6;
  opacity: 0.45;
}

body.theme-light .theme-toggle-icon--sun {
  color: #f59e0b;
  opacity: 0.98;
}

body.theme-light .theme-toggle-thumb {
  transform: translateX(44px);
  background: #0f172a;
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.28);
}

body.theme-light .theme-toggle-thumb::before {
  content: '☼';
  color: #f8c74f;
}

body.lang-zh #hero-title {
  font-family:
    'Noto Serif SC',
    'Songti SC',
    'STSong',
    'PingFang SC',
    'Hiragino Sans GB',
    'Microsoft YaHei',
    serif;
  font-style: normal;
  letter-spacing: 0;
  line-height: 1.14;
  max-width: 56rem;
  word-break: keep-all;
  line-break: loose;
}

body.lang-zh #hero-kicker {
  text-transform: none;
}

#category-tabs {
  position: sticky !important;
  top: calc(var(--header-offset) - 1px) !important;
  z-index: 48 !important;
  display: flex;
  flex-wrap: nowrap !important;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  border-bottom: none !important;
}

#category-tabs::-webkit-scrollbar {
  display: none;
}

/* Custom Tailwind-like Utilities for Glass */
.glass {
  background: var(--color-surface);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--color-border);
}

.glass-header {
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: none;
  transition: background-color 0.2s ease, backdrop-filter 0.2s ease, -webkit-backdrop-filter 0.2s ease;
}

body.is-scrolled .glass-header,
body.is-scrolled #category-tabs {
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.accent-gradient {
  background: linear-gradient(135deg, var(--color-accent) 0%, #00a3ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Specific Component Styles */
.brand-wordmark {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.02em;
}

.category-pill {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.category-pill:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.category-pill.is-active {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}

.category-pill.is-active:hover,
.category-pill.is-active:focus-visible {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}

/* Card Glow Effect */
.grid-card {
  position: relative;
  transition: all 0.5s cubic-bezier(0.23, 1, 0.32, 1);
}

.grid-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  background: linear-gradient(45deg, transparent, var(--color-border), transparent);
  z-index: -1;
  border-radius: inherit;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.grid-item:hover .grid-card::before {
  opacity: 1;
}

.grid-item:hover .grid-card {
  transform: translateY(-8px) scale(1.02);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.card-cta-arrow {
  transition: all 0.25s ease;
}

.grid-item:hover .card-cta-arrow {
  background: rgba(0, 255, 209, 0.14);
  border-color: rgba(0, 255, 209, 0.65);
  color: #c7fff4;
  transform: scale(1.08);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: #333;
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: #444;
}

/* Shimmer Animation for loading state */
@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.is-loading {
  position: relative;
  overflow: hidden;
  background: #111 !important;
}

.is-loading::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.05), transparent);
  animation: shimmer 1.5s infinite;
}

/* Detail View Layout */
.detail-view {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

@media (min-width: 1024px) {
  .detail-column-head {
    min-height: 48px;
    align-items: center;
  }
}

.detail-markdown-content {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
  scrollbar-color: rgba(100, 116, 139, 0.45) transparent;
}

.detail-markdown-content::-webkit-scrollbar {
  width: 8px;
}

.detail-markdown-content::-webkit-scrollbar-track {
  background: transparent;
}

.detail-markdown-content::-webkit-scrollbar-thumb {
  background: rgba(100, 116, 139, 0.45);
  border-radius: 999px;
}

.detail-markdown-content::-webkit-scrollbar-thumb:hover {
  background: rgba(100, 116, 139, 0.58);
}

body.theme-light .detail-markdown-content::-webkit-scrollbar-thumb {
  background: rgba(100, 116, 139, 0.34);
}

body.theme-light .detail-markdown-content::-webkit-scrollbar-thumb:hover {
  background: rgba(100, 116, 139, 0.46);
}

@media (max-width: 1024px) {
  .detail-view {
    grid-template-columns: 1fr;
  }
}